Structure direct agent-assisted hydrothermal synthesis and small gases adsorption behavior of pure RHO zeolite

Kim, Beom-Ju, Sharma, Pankaj ORCID: https://orcid.org/0000-0003-2319-260X, Han, Moon-Hee and Cho, Churl-Hee 2014. Structure direct agent-assisted hydrothermal synthesis and small gases adsorption behavior of pure RHO zeolite. Journal of Energy Engineering 23 (4) , pp. 141-149. 10.5855/ENERGY.2014.23.4.141

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Abstract

In the present study, pure RHO zeolite was hydrothermally synthesized by using 18-crown-6 ether as a structure directing agent(SDA), and the small gases adsorption was investigated. Synthesized RHO zeolite was a cube shape particle of which average edge length was around 1.2μm and composed of primary crystallites having a diameter of around 100 to 200 nm. RHO zeolite structure was stable under 3h calcination at 600∘C. Water adsorption data announced that RHO zeolite has a specific surface area of 483.32 m2/g and its micropore diameter was about 4 A. Gas adsorption was studied in the pressure range of 50 to 500 kPa for CO2, N2, O2 and H2. It was evident that RHO zeolite showed a strong CO2 adsorption behavior. Especially, RHO zeolite showed a transient CO2 adsorption behavior. The 3h CO2 up-take at 50 kPa and 500 kPa was 1.283 and 3.357 mmol/g, respectively. The CO2/H2 selectivity was around 16 at 500 kPa. Compared with gas adsorption data for some representative microporous adsorbents, it was certain that RHO zeolite is a beneficial adsorbent for CO2/H2 separation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
ISSN:	1598-7981
Date of Acceptance:	4 December 2014
Last Modified:	16 Nov 2022 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/153543

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